henrike@webrtc.org | f7795df | 2014-05-13 18:00:26 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * SHA-1 in C |
| 3 | * By Steve Reid <sreid@sea-to-sky.net> |
| 4 | * 100% Public Domain |
| 5 | * |
| 6 | * ----------------- |
| 7 | * Modified 7/98 |
| 8 | * By James H. Brown <jbrown@burgoyne.com> |
| 9 | * Still 100% Public Domain |
| 10 | * |
| 11 | * Corrected a problem which generated improper hash values on 16 bit machines |
| 12 | * Routine SHA1Update changed from |
| 13 | * void SHA1Update(SHA1_CTX* context, unsigned char* data, unsigned int |
| 14 | * len) |
| 15 | * to |
| 16 | * void SHA1Update(SHA1_CTX* context, unsigned char* data, unsigned |
| 17 | * long len) |
| 18 | * |
| 19 | * The 'len' parameter was declared an int which works fine on 32 bit machines. |
| 20 | * However, on 16 bit machines an int is too small for the shifts being done |
| 21 | * against |
| 22 | * it. This caused the hash function to generate incorrect values if len was |
| 23 | * greater than 8191 (8K - 1) due to the 'len << 3' on line 3 of SHA1Update(). |
| 24 | * |
| 25 | * Since the file IO in main() reads 16K at a time, any file 8K or larger would |
| 26 | * be guaranteed to generate the wrong hash (e.g. Test Vector #3, a million |
| 27 | * "a"s). |
| 28 | * |
| 29 | * I also changed the declaration of variables i & j in SHA1Update to |
| 30 | * unsigned long from unsigned int for the same reason. |
| 31 | * |
| 32 | * These changes should make no difference to any 32 bit implementations since |
| 33 | * an |
| 34 | * int and a long are the same size in those environments. |
| 35 | * |
| 36 | * -- |
| 37 | * I also corrected a few compiler warnings generated by Borland C. |
| 38 | * 1. Added #include <process.h> for exit() prototype |
| 39 | * 2. Removed unused variable 'j' in SHA1Final |
| 40 | * 3. Changed exit(0) to return(0) at end of main. |
| 41 | * |
| 42 | * ALL changes I made can be located by searching for comments containing 'JHB' |
| 43 | * ----------------- |
| 44 | * Modified 8/98 |
| 45 | * By Steve Reid <sreid@sea-to-sky.net> |
| 46 | * Still 100% public domain |
| 47 | * |
| 48 | * 1- Removed #include <process.h> and used return() instead of exit() |
| 49 | * 2- Fixed overwriting of finalcount in SHA1Final() (discovered by Chris Hall) |
| 50 | * 3- Changed email address from steve@edmweb.com to sreid@sea-to-sky.net |
| 51 | * |
| 52 | * ----------------- |
| 53 | * Modified 4/01 |
| 54 | * By Saul Kravitz <Saul.Kravitz@celera.com> |
| 55 | * Still 100% PD |
| 56 | * Modified to run on Compaq Alpha hardware. |
| 57 | * |
| 58 | * ----------------- |
| 59 | * Modified 07/2002 |
| 60 | * By Ralph Giles <giles@ghostscript.com> |
| 61 | * Still 100% public domain |
| 62 | * modified for use with stdint types, autoconf |
| 63 | * code cleanup, removed attribution comments |
| 64 | * switched SHA1Final() argument order for consistency |
| 65 | * use SHA1_ prefix for public api |
| 66 | * move public api to sha1.h |
| 67 | * |
| 68 | * ----------------- |
| 69 | * Modified 02/2012 |
| 70 | * By Justin Uberti <juberti@google.com> |
| 71 | * Remove underscore from SHA1 prefix to avoid conflict with OpenSSL |
| 72 | * Remove test code |
| 73 | * Untabify |
| 74 | * |
| 75 | * ----------------- |
| 76 | * Modified 03/2012 |
| 77 | * By Ronghua Wu <ronghuawu@google.com> |
| 78 | * Change the typedef of uint32(8)_t to uint32(8). We need this because in the |
| 79 | * chromium android build, the stdio.h will include stdint.h which already |
| 80 | * defined uint32(8)_t. |
| 81 | * |
| 82 | * ----------------- |
| 83 | * Modified 04/2012 |
| 84 | * By Frank Barchard <fbarchard@google.com> |
| 85 | * Ported to C++, Google style, change len to size_t, enable SHA1HANDSOFF |
| 86 | * |
| 87 | * Test Vectors (from FIPS PUB 180-1) |
| 88 | * "abc" |
| 89 | * A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D |
| 90 | * "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq" |
| 91 | * 84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1 |
| 92 | * A million repetitions of "a" |
| 93 | * 34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F |
| 94 | */ |
| 95 | |
| 96 | // Enabling SHA1HANDSOFF preserves the caller's data buffer. |
| 97 | // Disabling SHA1HANDSOFF the buffer will be modified (end swapped). |
| 98 | #define SHA1HANDSOFF |
| 99 | |
| 100 | #include "webrtc/base/sha1.h" |
| 101 | |
| 102 | #include <stdio.h> |
| 103 | #include <string.h> |
| 104 | |
| 105 | void SHA1Transform(uint32 state[5], const uint8 buffer[64]); |
| 106 | |
| 107 | #define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits)))) |
| 108 | |
| 109 | // blk0() and blk() perform the initial expand. |
| 110 | // I got the idea of expanding during the round function from SSLeay |
| 111 | // FIXME: can we do this in an endian-proof way? |
| 112 | #ifdef ARCH_CPU_BIG_ENDIAN |
| 113 | #define blk0(i) block->l[i] |
| 114 | #else |
| 115 | #define blk0(i) (block->l[i] = (rol(block->l[i], 24) & 0xFF00FF00) | \ |
| 116 | (rol(block->l[i], 8) & 0x00FF00FF)) |
| 117 | #endif |
| 118 | #define blk(i) (block->l[i & 15] = rol(block->l[(i + 13) & 15] ^ \ |
| 119 | block->l[(i + 8) & 15] ^ block->l[(i + 2) & 15] ^ block->l[i & 15], 1)) |
| 120 | |
| 121 | // (R0+R1), R2, R3, R4 are the different operations used in SHA1. |
| 122 | #define R0(v, w, x, y, z, i) \ |
| 123 | z += ((w & (x ^ y)) ^ y) + blk0(i) + 0x5A827999 + rol(v, 5); \ |
| 124 | w = rol(w, 30); |
| 125 | #define R1(v, w, x, y, z, i) \ |
| 126 | z += ((w & (x ^ y)) ^ y) + blk(i) + 0x5A827999 + rol(v, 5); \ |
| 127 | w = rol(w, 30); |
| 128 | #define R2(v, w, x, y, z, i) \ |
| 129 | z += (w ^ x ^ y) + blk(i) + 0x6ED9EBA1 + rol(v, 5);\ |
| 130 | w = rol(w, 30); |
| 131 | #define R3(v, w, x, y, z, i) \ |
| 132 | z += (((w | x) & y) | (w & x)) + blk(i) + 0x8F1BBCDC + rol(v, 5); \ |
| 133 | w = rol(w, 30); |
| 134 | #define R4(v, w, x, y, z, i) \ |
| 135 | z += (w ^ x ^ y) + blk(i) + 0xCA62C1D6 + rol(v, 5); \ |
| 136 | w = rol(w, 30); |
| 137 | |
| 138 | #ifdef VERBOSE // SAK |
| 139 | void SHAPrintContext(SHA1_CTX *context, char *msg) { |
| 140 | printf("%s (%d,%d) %x %x %x %x %x\n", |
| 141 | msg, |
| 142 | context->count[0], context->count[1], |
| 143 | context->state[0], |
| 144 | context->state[1], |
| 145 | context->state[2], |
| 146 | context->state[3], |
| 147 | context->state[4]); |
| 148 | } |
| 149 | #endif /* VERBOSE */ |
| 150 | |
| 151 | // Hash a single 512-bit block. This is the core of the algorithm. |
| 152 | void SHA1Transform(uint32 state[5], const uint8 buffer[64]) { |
| 153 | union CHAR64LONG16 { |
| 154 | uint8 c[64]; |
| 155 | uint32 l[16]; |
| 156 | }; |
| 157 | #ifdef SHA1HANDSOFF |
| 158 | static uint8 workspace[64]; |
| 159 | memcpy(workspace, buffer, 64); |
| 160 | CHAR64LONG16* block = reinterpret_cast<CHAR64LONG16*>(workspace); |
| 161 | #else |
| 162 | // Note(fbarchard): This option does modify the user's data buffer. |
| 163 | CHAR64LONG16* block = const_cast<CHAR64LONG16*>( |
| 164 | reinterpret_cast<const CHAR64LONG16*>(buffer)); |
| 165 | #endif |
| 166 | |
| 167 | // Copy context->state[] to working vars. |
| 168 | uint32 a = state[0]; |
| 169 | uint32 b = state[1]; |
| 170 | uint32 c = state[2]; |
| 171 | uint32 d = state[3]; |
| 172 | uint32 e = state[4]; |
| 173 | |
| 174 | // 4 rounds of 20 operations each. Loop unrolled. |
| 175 | // Note(fbarchard): The following has lint warnings for multiple ; on |
| 176 | // a line and no space after , but is left as-is to be similar to the |
| 177 | // original code. |
| 178 | R0(a,b,c,d,e,0); R0(e,a,b,c,d,1); R0(d,e,a,b,c,2); R0(c,d,e,a,b,3); |
| 179 | R0(b,c,d,e,a,4); R0(a,b,c,d,e,5); R0(e,a,b,c,d,6); R0(d,e,a,b,c,7); |
| 180 | R0(c,d,e,a,b,8); R0(b,c,d,e,a,9); R0(a,b,c,d,e,10); R0(e,a,b,c,d,11); |
| 181 | R0(d,e,a,b,c,12); R0(c,d,e,a,b,13); R0(b,c,d,e,a,14); R0(a,b,c,d,e,15); |
| 182 | R1(e,a,b,c,d,16); R1(d,e,a,b,c,17); R1(c,d,e,a,b,18); R1(b,c,d,e,a,19); |
| 183 | R2(a,b,c,d,e,20); R2(e,a,b,c,d,21); R2(d,e,a,b,c,22); R2(c,d,e,a,b,23); |
| 184 | R2(b,c,d,e,a,24); R2(a,b,c,d,e,25); R2(e,a,b,c,d,26); R2(d,e,a,b,c,27); |
| 185 | R2(c,d,e,a,b,28); R2(b,c,d,e,a,29); R2(a,b,c,d,e,30); R2(e,a,b,c,d,31); |
| 186 | R2(d,e,a,b,c,32); R2(c,d,e,a,b,33); R2(b,c,d,e,a,34); R2(a,b,c,d,e,35); |
| 187 | R2(e,a,b,c,d,36); R2(d,e,a,b,c,37); R2(c,d,e,a,b,38); R2(b,c,d,e,a,39); |
| 188 | R3(a,b,c,d,e,40); R3(e,a,b,c,d,41); R3(d,e,a,b,c,42); R3(c,d,e,a,b,43); |
| 189 | R3(b,c,d,e,a,44); R3(a,b,c,d,e,45); R3(e,a,b,c,d,46); R3(d,e,a,b,c,47); |
| 190 | R3(c,d,e,a,b,48); R3(b,c,d,e,a,49); R3(a,b,c,d,e,50); R3(e,a,b,c,d,51); |
| 191 | R3(d,e,a,b,c,52); R3(c,d,e,a,b,53); R3(b,c,d,e,a,54); R3(a,b,c,d,e,55); |
| 192 | R3(e,a,b,c,d,56); R3(d,e,a,b,c,57); R3(c,d,e,a,b,58); R3(b,c,d,e,a,59); |
| 193 | R4(a,b,c,d,e,60); R4(e,a,b,c,d,61); R4(d,e,a,b,c,62); R4(c,d,e,a,b,63); |
| 194 | R4(b,c,d,e,a,64); R4(a,b,c,d,e,65); R4(e,a,b,c,d,66); R4(d,e,a,b,c,67); |
| 195 | R4(c,d,e,a,b,68); R4(b,c,d,e,a,69); R4(a,b,c,d,e,70); R4(e,a,b,c,d,71); |
| 196 | R4(d,e,a,b,c,72); R4(c,d,e,a,b,73); R4(b,c,d,e,a,74); R4(a,b,c,d,e,75); |
| 197 | R4(e,a,b,c,d,76); R4(d,e,a,b,c,77); R4(c,d,e,a,b,78); R4(b,c,d,e,a,79); |
| 198 | |
| 199 | // Add the working vars back into context.state[]. |
| 200 | state[0] += a; |
| 201 | state[1] += b; |
| 202 | state[2] += c; |
| 203 | state[3] += d; |
| 204 | state[4] += e; |
| 205 | } |
| 206 | |
| 207 | // SHA1Init - Initialize new context. |
| 208 | void SHA1Init(SHA1_CTX* context) { |
| 209 | // SHA1 initialization constants. |
| 210 | context->state[0] = 0x67452301; |
| 211 | context->state[1] = 0xEFCDAB89; |
| 212 | context->state[2] = 0x98BADCFE; |
| 213 | context->state[3] = 0x10325476; |
| 214 | context->state[4] = 0xC3D2E1F0; |
| 215 | context->count[0] = context->count[1] = 0; |
| 216 | } |
| 217 | |
| 218 | // Run your data through this. |
| 219 | void SHA1Update(SHA1_CTX* context, const uint8* data, size_t input_len) { |
| 220 | size_t i = 0; |
| 221 | |
| 222 | #ifdef VERBOSE |
| 223 | SHAPrintContext(context, "before"); |
| 224 | #endif |
| 225 | |
| 226 | // Compute number of bytes mod 64. |
| 227 | size_t index = (context->count[0] >> 3) & 63; |
| 228 | |
| 229 | // Update number of bits. |
| 230 | // TODO: Use uint64 instead of 2 uint32 for count. |
| 231 | // count[0] has low 29 bits for byte count + 3 pad 0's making 32 bits for |
| 232 | // bit count. |
| 233 | // Add bit count to low uint32 |
| 234 | context->count[0] += static_cast<uint32>(input_len << 3); |
| 235 | if (context->count[0] < static_cast<uint32>(input_len << 3)) { |
| 236 | ++context->count[1]; // if overlow (carry), add one to high word |
| 237 | } |
| 238 | context->count[1] += static_cast<uint32>(input_len >> 29); |
| 239 | if ((index + input_len) > 63) { |
| 240 | i = 64 - index; |
| 241 | memcpy(&context->buffer[index], data, i); |
| 242 | SHA1Transform(context->state, context->buffer); |
| 243 | for (; i + 63 < input_len; i += 64) { |
| 244 | SHA1Transform(context->state, data + i); |
| 245 | } |
| 246 | index = 0; |
| 247 | } |
| 248 | memcpy(&context->buffer[index], &data[i], input_len - i); |
| 249 | |
| 250 | #ifdef VERBOSE |
| 251 | SHAPrintContext(context, "after "); |
| 252 | #endif |
| 253 | } |
| 254 | |
| 255 | // Add padding and return the message digest. |
| 256 | void SHA1Final(SHA1_CTX* context, uint8 digest[SHA1_DIGEST_SIZE]) { |
| 257 | uint8 finalcount[8]; |
| 258 | for (int i = 0; i < 8; ++i) { |
| 259 | // Endian independent |
| 260 | finalcount[i] = static_cast<uint8>( |
| 261 | (context->count[(i >= 4 ? 0 : 1)] >> ((3 - (i & 3)) * 8) ) & 255); |
| 262 | } |
| 263 | SHA1Update(context, reinterpret_cast<const uint8*>("\200"), 1); |
| 264 | while ((context->count[0] & 504) != 448) { |
| 265 | SHA1Update(context, reinterpret_cast<const uint8*>("\0"), 1); |
| 266 | } |
| 267 | SHA1Update(context, finalcount, 8); // Should cause a SHA1Transform(). |
| 268 | for (int i = 0; i < SHA1_DIGEST_SIZE; ++i) { |
| 269 | digest[i] = static_cast<uint8>( |
| 270 | (context->state[i >> 2] >> ((3 - (i & 3)) * 8) ) & 255); |
| 271 | } |
| 272 | |
| 273 | // Wipe variables. |
| 274 | memset(context->buffer, 0, 64); |
| 275 | memset(context->state, 0, 20); |
| 276 | memset(context->count, 0, 8); |
| 277 | memset(finalcount, 0, 8); // SWR |
| 278 | |
| 279 | #ifdef SHA1HANDSOFF // Make SHA1Transform overwrite its own static vars. |
| 280 | SHA1Transform(context->state, context->buffer); |
| 281 | #endif |
| 282 | } |